Fuel injection nozzle



2 sheets-*sheet 2 BY THEIR l ATTORNEYS 2 1 1 um z R P Nl O T L M ls HH W DI v R f www /0 /0 RE mm f w w v w Tiff ,jc zz W. T. TABB I'AL FUEL INJECTION NOZZLE Filed March 8, 1959 Nov. 18, 1941.

Patented Nov. 18, l`9`41 t FUELy mmc'rloN Nozzm:

Warner '.l. Tabl, Brooklyn, N. Y., and Everett M.

1 f Purdy, New Canaan. Conmgassignors to Eisemann Magneto Corporation, New York, N. Y., i a corporation of New York Appueemn Meren s, 1939, serien No. 260.610

I9 Claims. (Cl. Zilli-107.6) Y v 'I'his invention-relates to fuel injection nozzles Vfor internal combustion engines and it is an object of this invention to provide an` improved nozzle of the typedescribed in which `a valve controls thel owjfof fuel to the discharge orifice of the nozzle and the discharge from the nozzle is controlled by .the cooperation of the stem of the controllingvalve andthe edge of the discharge oriiice of the nozzle tip.

VIn the drawings:

Figure 1 is' a broken longitudinal sectional view of a fuel injection nozzle constructed in accordance with this invention, lthe'stem being shown `in elevation; v

Figures2 and 3 are transverse sectional views, takenas on line A-A of Figure 1,'Figure 2 becupped disks 26* and 'fiat disks 2t. of spring metal and of less diameter than the chamber II.

The spring 20 is confined between a collar 24 spring 26 has been overcome.

ing a view looking toward the discharge end of the nome and Figure 3 a view looking in the opposite direction;

Figure4isaview,similartoFigure1and drawn to a larger scale'of a portion of the discharge end of the nozzle of Figure 1; and

Figuresl, 6 and 'l are views similar to Figure 4 of discharge nomles having stems of modiiledl construction.

A fuel injection nomle constructed in accordance with this invention is shown'in Figures 1 to 4 as comprising a tip member I having a cenntrai rbore 2 to'receive the stem 4 and shouldered on the nut 24 and a washer 2l which Surrounds the sleeve 24* of the nut 24 and is supported at its outer edge upon a wire ring I2. The wire ring 32 is supported upon the outer edge of a spring member 34 which, in turn, is supported upon a wi're ring 3i which rests upon the bottomof the recess in the tip I. The inner edge of the spring member I4 surrolmds the stem 4 in position to be engaged by the lower end of the skirt 24n of the nut 24 and to serve as a cushioning member limitingthe downward or opening movement of the stem 4 and nut 24 after the resistance of The bore 2 of the tip I is connterbored and madev of greater 'diameter for a portion of its length as at 2*, adjacent the discharge end thereofandthestem4hasanendportion42 ofa diameter and length to substantially fit the portion 2l of the bore 2. 'Ihe portion 4 2 of the stem 4 is joined by a tapered or conical'valve portion 42 to a portion 44 oflessl diameter than that ofthe bore 2. The conical valve portion 43 4 is arranged to-c'ooperate. with a correspondingly inclined seat portion of the wall of the bore 2, as at 2, at the junction of the portion 2'l withthe remainder of the bore 2, in controlling the ow to the discharge end of the nozzle. The stem 4 is provided with grooves 45 opening to the portion 44 of the stem to permitcof the flow of fuel along -the stem 4 to the valve portion 4l. Fuel can ilow totheV stem 4 from the pipe 2II by means of the passage I8 in the holder I2 to the chamber IB and through grooves 24h and openings 24 in the skirt- 24* of the nut 24 to the grooves 45.

I2' by means of bolts (not shown) tting in openings I4* of the plate `I4 and threaded into the engine cylinder casting.' The abutting-ends of thenozzle holder I2 and the tip I are recessed to form a; chamber I8 whichis open to the bore is seeuredto the .einer end or thenolder lz by g The stem 4 projecteurs che bemoei le vma is threaded at its upper end; as at 4I to receive a nut 24whichis secured in position by a cotter pin .25jenga8`edin a-slot orgroove in the nut 24 andan opening. in` thestein 4. The nut-24 has 'a skirt 24.which' lits about thestem 4 andjy serves as a fori'the'disks vof thecspring'zt.

Fuel in the chamber I6 can also pass along the 'outer edges of the disks oi spring 26 Vand through 44 which extends completely around the end por-V .tion 42. Inwardly of the distributing groove the `end portion 42 is ground or cut away to provide apluraiity of flat portions or surfaces 41 extendingrfrom the, valve portion 43 to the distributing groove 4S and providing lsupply pasv.toth'e distributing groove 46. outwardly of the distributing groovethe end portion 42 is provided with a plurality or fiat surfaces 4.4 which extend a short distance of the outer end of the stem 4.` The surfaces 48 gradually reduce in width towards their outer ends and are inclined, with respect to the longitudinal axis of the stem 4 so' that the surfaces 48 form with the wall of the bore portion 2a passagesfor the discharge of fuel from the distributing to the engine cylinder which graduallyreduce in width and depth from the distributing groove 46 towards the discharge end of the nozzle. The surfaces` 41, it will be noted, are wider and fewer in number than the surfaces 48 and the passages formed by the surfaces 41 and the wall of the bore portion 2a are of greater capacity than the passages formed by the surfaces 48 and the wall of bore portion 2S.

In the operation of the fuel nozzle described, fuel under pressure is supplied through pipe and passage I8 to the chamber I6 and passes through grooves. 24b and openings 24C, and also through openings a, to the grooves 45 of the stem 4 and the bore 2 inthe region of the valve portion 43 of the stem. Upon the operation of the pump placing the fuel under sulcient pressure, the unbalanced pressure of the fuel acting upon the stem 4 overcomes the resistance of the spring 26 and operates the stem 4 to separate the valve portion 43 thereof from the seat portion 2c of the wall of the bore 2. Upon the separation of the valve portion 43 from the seat portion 2c fuel under pressure flows past the valve portion 43 and subjects the stem 4 to additional unbalanced hydraulic pressure as it flows past the surfaces 41 to the distributing groove 46 and then past the surfaces 48 to discharge from the nozzle, the movement oft the stem 4 causing the surfaces 48 to project to a greater or less extent beyond the end of the tip I and gradually open the passages between the surfaces 48 and the wall of the bore-portion 2a as the stem 4 is moved outwardly. subjecting the stem 4 to the additional unbalanced hydraulic pressure upon the opening of the valve accelerates the opening movement of the valve. Movement of the stem 4 outwardly continues with the compression of the spring 26 by the fuel pressure until the lower end of the skirt 24a of the nut 24 engages the spring member 34 and further movement outwardly of the stem 4 is prevented by the combined resistance of the springs 26 and 34. 'Ihe fuel pressure at which the v alve portion 43 is separated from the seat portion 2c depends upon the initial stress given to the spring 26; that is, the extent to which the spring 26 is stressed when the valve portion 43 engages the seat portion 2, and this stress can be adjusted by substituting collars 28 and rings 32 of different height. The nut 24 is adjusted on the stem 4 to determine the maximum movement of the stem 4.

In the modied construction shown in Figure 5, the tip I is provided with a. bore 2 to receive a stem 4, the lower end of the bore being of greater diameter, as at 2a, the same a's in the construcportion 44 of reduced diameter, the conical valve portion 43 which cooperates with the seat portion 2 of the wall of the bore 2, and the end portion 42 which substantially fills the bore portion 2*. Extending outwardly from the lower or outer edge of the valve portion 43 the end stem portion is provided with a plurality of flat sur,- faces 49 which extend parallel to the longitudinal axis of the stem 4 and at their outer ends are CTI 'tionvpreviously described.4 The stem 4 has the joined to flat surfaces 48 which gradually taper in width towards their outer ends and are inclined from the distributing groove outwardly to within outwardly so as to form with the wall of the bore portion 2a passages which gradually reduce in cross-sectional area. In this construction, the surfaces 49 form supply passages of uniform cross-sectional area leading from the valve portion 43 to the discharge passages 48, there being a supply passage individual to each discharge passage.4

In the modified construction shown in Figure 6 the tip I has the bore 2 which is enlarged, as at 2 and the wall thereof is inclined, as at 2 to formMa valve seat and the stem 4 has a portion 44 of reduced diameter, a conical valve portion v43 and an endportion 50. The end portion 50 has a cylindrical portion 5I thereof which is of less diameter than the bore 2? and a conical por-Y tion 52 which gradually increases in diameter outwardly from its junction with the portion 5I to the full diameter of the bore 2il so that an annular passage of uniform cross-section is formed about the portion 5I extending from the valve portion 43 to the conical portion 52 and the conical portion 52 forms with the walls of the bore portion 2a a discharge passage which provides a discharge opening of gradually increasing area as the stem 4 is moved outwardly beyond the end of the tip I. The end portion 50 also comprises a cylindrical portion 53 of the full diameter of the enlarged portion 2"L of the bore and of sulicient length to extend to the face of the tip I when the valve portion 43 of the stem is engaged with the valve seat at 2c.

The conical surface 52 instead of being used with a cylindrical surface 5I of less diameter than the bore 2a as in Figure 6 can be used with dat surfaces, as the surfaces 41 and 49 of Figures 4 and 5, respectively, which flat surfaces can extend directly to the conical surface 52 in the same way surfaces 49 extend to the surfaces 48 in Figure 5 or a V-shaped groove can be in-V terposed between the flat surfaces and the conical surface in the way the groove 46 is interposed between the surfaces 41 and 48 of Figure 4.

In the modified construction shown in Figure 7 Lthe bore in the tip I is of uniform diameter for the major portion of its length inwardly from its outer end, as at 60:- Adjacent its inner end the bore is enlarged for/ashort distance, as at 6I, and then is of less diameter to the upper end of the tip, as at 62, than elsewhere in the tip. Between the portions 6I and 62 of the bore, the wall of the bore is inclined, as at 63, to form a conicalvalve seat. The stem 64 fitting the bore has a conical portion 65 which forms a valve cooperating with the valve seat portion 63 and connects the stem portion 66, which is of reduced diameter and extends through the disk spring, with the stem portion 68. The stem portion 68 is of a diameter to t the bore portion 6I) and is provided with flat portions 69 which extend from the conical valve portion 65 to a distributing groove 10 which' encircles the stem. Outwardly from the distribution groove 10 the stem 64 is formed with a conical portionl 1I which increases in diameter towards the outer end of the stem and at its end the stem is provided with a cylindrical portion 12. The stem 64 is of such length that when the conical valve portion 65 is seated on the valve seat 63 the outer face of the cylindrical portion 12 is flush with the outer face In this construction, when the stem is operated by fuel pressure the conical valve portion 65 is moved from the valve seat 63 and fuel ows along the nat portions 69 of the stem portion 68 to the distributing groove 10. `The cylindrical portion 12 restricts the discharge opening during the initial movement of the valve portion 65 from its seat and thereafter the conical portion 'H cooperates with the outer edge of the bore in forming an annular discharge opening which increases in capacity gradually as the stem moves outwardly under the pressure of the fuel.

It will be'noted that inall modifications thel bore in the tip member terminates in a discharge end and that the stem member outwardly of the valve has a circumambient surface portion which cooperatively makes continuous contact with a coaxially arranged circumambient portion of the surface of the bore when the valve is in closed position, effectively to close the discharge orifice provided between surfaces of the bore and stem member when the valve is opened. Though preferred, obviously `these cooperating contacting bore and stem member circumambient surface portions need not be cylindrical. This secure closing of the orifice at th'e discharge end of the nozzle vprevents undue fuel drippage after the nozzle valve is closed.

In vthe construction of Figure 7, the stem is always supported by the long cylindrical portion 68 of larger diameter and by the cylindrical porgreater cross-sectional area than a cross-section of said stem through said valve, and said nozzle having a discharge orifice between peripheral surfaces of said stem and bore portions of greater cross-sectional area, said stem and bore portions outwardly of said valvehaving portions providing substantially concentric contactingsurfaces imparting guidance during the operative movement of said stem member in said bore.

2. .A nozzle of the fuel injection type comprising a tip member having a bore therein terminating in a discharge end, a stem member slidably'mounted in said bore, said tip and stem members having cooperating shoulders forming 15 (a valve in said bore intermediate the length of said stem member, spring means positioned inwardly of said valve for closing said valve by an inward movement of said stem member, said valve when closed preventing iiow of fuel for tion 12 when the valve portion 65 is seated. In

the construction of Figures 1, 4 and 5 the stem d is supported at all times by the grooved p0rtion of smaller diameter and by the portion 42 of larger dia-meter while in Figure 6 the stem is supported at vall times by the grooved portion of smaller diameter and by the cylindrical portion 53 of larger diameter only when the valve portion 43 is seated or nearly so.

In the specifica-tion and claims the term outwardly is used to indicate in thev direction of in the specification have cylindrical bores in the tip member that have normal cross-sections which are circular and the contacting guidance portion of the stem member formed with depressions. it is obvious that such arrangement could l be reversed and the stem member provided with a cylindrical surface, the cross-section of which is a circle while the bore `portions are cut away to provide fluted or depressed portions.

We claim:

l. A nozzle of the fuel injection type comprising a tip member having a bore therein, a stem member slidably mounted in said bore, said tip and stem members having cooperating shoulders forming a valve in said bore intermediate the length of said stem member, spring means posidischarge from said nozzle and being opened in the direction of fuel discharge by fuel pressure, said cooperating shoulders providing enlargements of saidstem and bore with portions of said stem and bore outwardly of said valve having la cross-sectional area greater than a section of said' stem through said valve, said stem and bore portions of 'greater cross-sectional area having cooperating contacting surfaces comprising circumambient portions coaxially-arranged outwardly of said valve, one ofsaid enlarged stem and vbore portions being substantially circular in cross-section, the other having inwardly of the circumambient contacting rsurface thereof at least one portion of its surface diverging inwardly away from the surface of said first-mentioned portion for providing between said portions at the discharge end of the bore a discharge orifice for said nozzle when said valve kis opened, said discharge orifice being effectively closed by said cooperating circumambient contacting surfaces when said valve is in closed position.

3. A nozzle of the fuel injection type comprising a tip member having a bore therein, a stem member slidably mounted in said bore, said tip and stem members having @ooperating shoulders forming a valve in said bore intermediate the length of saidI stem member, spring means positioned inwardly of said valve for closing said valve by inward movement of said stem member, said valve when closed preventing flow of fuel for discharge from said nozzle and being opened. in the direction of fuel discharge by fuel pressure, said cooperating shoulders providing enlargements of said stem and bore, said stem and bore having portions outwardly of said valveV having a cross-sectional area greater than a section of said stem through said valve, and said nozzle having a discharge orifice positioned between said stem member andthe surface of a portion of said bore outwardly of said valve, said stem and bore' portions outwardly of said valve being provided with portions having concentric tioned 'inwardly .of said valve for closing said valve by inward movement of said stem member, said valve when closed preventing flow of fuel for discharge from said nozzle and being opened in the directionofj fuel dischargebyfuel pressure, said cooperating 'shoulders providing enlargements of said stem and bore, said stem a nd bore .having portions outwardly of said valveof a contacting guidance surfaces, the cross-section tioned inwardly of said valve for closing said i valve by anV inward movement of said stemmemopened in the direction of fuel discharge by fuel pressure, said cooperating shoulders providing p enlargements of said stem and bore, said stem and bore outwardly of said valve having portions providing cooperating contacting surfaces concentrically arranged imparting guidance to said stem in said bore, that of said bore .being formed with a cross-sectional area greater than a section of said bore immediately inward of said valve, and said nozzle having a discharge orice positioned at the surface of an outer portion of said bore of said greater cross-sectional area and formed as a passage between cooperating portions of said stem and bore. i

5. A nozzle of the fuel injection type comprising a tip member having a bore therein, a stem member slidably mounted in said bore, said tip' and stem members having cooperating shoulders forming a valve in said bore intermediate the length of said stem member, spring means positioned inwardly of said valve for closing said valve by an inward movement of said stem member, said valve when closed preventing flow of fuel for discharge-from said nozzleand being opened in the direction of fuel discharge by fuel pressure, said cooperating shoulders providing enlargements of said stem and bore, said bore ranged when said stem is displaced relative to said bore tov provide a transverse orice area symmetrical about the'periphery of said stem and having increasing values with a valve opening movement.

6. A nozzle of the fuel injection type comprising a tip member having a bore therein, a stem member slidably mounted in said bore, said tip and stem members having cooperating shoulders l forming a valve in said bore intermediate the length of said stem member, spring means positioned inwardly of said valve for closing said valve by van inward movement of said stem member, said valve when closed preventing ow of fuel for discharge from said nozzle and being opened in the direction of fuel discharge by fuel pressure, said cooperating shoulders providing enlargements of said stem and bore, said stem and bore having portions outwardly of said valve having a greater cross-sectional area than a section of said bore immediately inward of said valve, said stem and said bore outwardly of said valve having portions providing contacting cooperating surfaces symmetrically arranged and providing a sliding t of said stem portion in a portion of said bore of said greater crosssectional area and said nozzle having a discharge Y orifice provided between and formed by surfaces of said stem and bore of Isaid greater cross-sectional area at the outermost end of one of said y stem end bore.

7. A nozzle of the fuel injection type comprising a tip member having a bore therein, a stem vmember slidably mounted in said bore, said tip and stem members having cooperating snoulders forming a valve in said bore intermediate the length of said stem member, spring means positioned inwardly of said valve for closing said l valve by inward movement of said stem member,

said valve when closed preventing ow of fuel for discharge from said nozzle and being opened in the direction of fuel discharge by fuel pressure, said cooperating shoulders providing enlargements of said stem and bore, said stem and bore having portions outwardly of said valve having a greater cross-sectional area than a cross-section of said stem through said valve, said stem and said bore outwardly of said valve having cooperating coaxial surfaces, one of which has portions providing guiding means engaging slidably with the other throughout the operative relative displacement of said stem and bore and positioned in a portion of said bore of said greater cross-sectional area, and having at least one depression therein forming with said other 4surface a discharge orifice for said nozzle.

8. A nozzle of the fuel injection type comprising a tip member having a bore therein, a stem member slidably mounted in said bore, said tip and stem members having cooperating shoulders forming a valve in saidbore intermediate the length of said stem member, spring means positioned inwardly of said valve for closing said valve by inward movement of said stem member, said valve when closed preventing flow of fuel for discharge from said nozzle and being opened in the direction of fuel discharge 'by fuel pressure, said cooperating shoulders providing enlargements of said stem and bore, said stem and bore having portions outwardly of said valve having a greater cross-sectional area than a cross-section of said stem through said valve, said stem and said bore outwardly of said valve having portions providing coaxial contacting surfaces symmetrically arranged and providing mutual guidance when said stem is sliding in a portion of said bore of said greater cross-sectional area, and additional guiding means on said stem inwardly of said valve slidably fitting l said bore, said nozzle having a discharge orifice between the surfaces of said stem and bore portions ci' greater cross-sectional area.

9. A nozzle of the fuel injection type comprising a tip member having a bore therein, a stem member slidably mounted in said bore, said tip'and stem members having cooperating shoulders forming a valve in said bore intermediate the length of said stem member, spring means positioned inwardly of said valve for closing said valve by inward movement of said stem member, said valve when closed preventing iiow of fuel for discharge from said nozzle and being opened in the direction of fuel discharge by fuel pressure, said cooperating shoulders providing enlargements of said stem and bore, said stem and borey having portions outwardly of said valve of a greater cross-sectional area than a cross-section of said stem through said valve, said stem and bore portions of greater cross-sectional area having cooperative coaxial surfaces, one of which is cylindrical, `the other having portions providing guiding means slidably engaging with the cylindrical surface throughout the operative relative displacement of said stem and bore, and surfaces other than those serving as guiding means 'converging outwardly in a manner approaching engagement for providing a discharge orifice for said nozzle vin line with an element of said cylindrical surface, said stem and bore oeing formed to provide a net effective area exposed to fluid pressure tending to open said valve which is greater when said valve is partly open than when said valve is closed. l

10. A nozzle of the fuel injection type comdischarge from said orifice.

tip and stem members having cooperating shoulders forming a valve in said bore intermediate the length of saidv stem member, spring means positioned inwardly of said valve for closing said valve by inward movement of said stem member, said valve when closed preventing iiow of fuel for discharge from said nozzle and being opened in the direction of 4fuel discharge by fuel pressure, said cooperating shoulders providing enlargements of said stem and bore, said stem and bore having portions outwardly of said valve of a greater cross-sectional .area than a cross-section of said stem through said valve, said stem and said bore outwardly of said valve having cooperative coaxial surfaces, one of which is cylin` drical, and other having portions providing guiding means slidably engaging with the cylindrical surface throughout .the operative relative displacement of said stem and bore, and surfaces other than those serving as guiding means converging outwardly in a manner approachingV engagement' for providing a discharge orifice for said nozzle dischargingin line with an element of said cylindrical surface, said. stem portion of greater cross-sectional area providing a net effective area exposed vto uid pressure acting in a direction to open said valve which is greater in all open positions of said valve than in the closed position thereof.v

11. vA nozzle of the fuel injection type comprising a tip member having a bore therein, a stem member slidably mounted in said bore, said tip and stem members having cooperating lshoulders forming a valve in said bore intermediate the length of said stem member, spring means positioned inwardly of said valve for closgreater cross-sectional area than a cross-section of said stem through said valve, said stem and said bore outwardly of said valve having cooperative coaxial surfaces, the surface of said bore being cylindrical, the surface of said stem having portions providing guiding means slidably engaging with the cylindrical surface throughout the operative relative displacement of said stem and bore, and surfaces other than those serving as guiding meansI converging outwardly in a manner approaching engagement for providing a discharge orice for said nozzle at the point of con"- vergence, said converging surfaces `being shaped at such point to be substantially cylindrical to form an annular orice which increases in area with valve opening movement.

13. A nozzle of the fuel injection type comprising a tip member having a bore therein, a stem member slidably mounted in said bore, said tip and stem members having cooperating shoul ders forming a valve in said bore intermediatev the length of said stem member, spring means positioned inwardly of said valve for closing said valve by inward movement of said stem member, said valve when closed preventing flow of fuel for discharge from said nozzle andbeing ing cooperative coaxial surfaces, one f which is drical surface throughout the operative relative ing said valve by inward movement of said stem member, said valve' when closed preventing flow of fuel for discharge from said nozzle and being opened in the direction of fuel discharge by fuel pressure,- said cooperating shoulders providing enlargements of said stem and bore, said` stem and bore having portions outwardly of said valve of Va greater cross-sectional area than a cross-section of said stem through said valve, and said stem and bore portions of greater cross-sectional area havingcooperative coaxial surfaces, one of which is cylindrical, the other having portions Vproviding guiding .means slidably engaging with the cylindrical surface throughout the operative relative displacement of said stem and bore, and

` -surfaces other than those servingas guiding means converging outwardly ina manner approaching engagement for providing a discharge orifice for said nozzle, said surface portions which serve as guiding means having vsliding contact in the same transverse plane with said cy1in'l drical surface at said discharge orifice during cylindrical, the other having portions providing guiding means slidably engaging with the cylindisplacement of said stem and bore, and surfaces other than those serving as guidingV means converging outwardly in a manner approaching engagement for providing a discharge orifice at the point' of convergence of said surfaces, said guiding means being `arranged to provide sliding contact at said discharge orifice and in the same 4B transverse plane therewith, Y

14. A nozzle .of the fuel injection type comprising a tip member having a bore therein, a

Ystem member slidably mounted in said bore, said tip and stem members having cooperating shoulliders forming a valve insaid bore intermediate for discharge from said nozzle and being openedY 12. A' nozzle of the fuel injection type comprising a tip member having a bore therein, a

stem member slidably mounted in said bore, said tip and stem members having cooperating shoulders forming a valve in said bore intermediate the length of saidstem member, spring means said valve when closed preventing flow of fuel for discharge from said nozzle and being opened in the direction of fuelv discharge by fuel pres- `positioned inwardly of said valve forclosing said valve by inward movement of said stem member,

the length of said stem member,l spring means positioned inwardly of said valve for closing said valve by inward movement of said stem member, said valve when closed preventing flow of fuel in the direction of fuel discharge by fuel pressure, said cooperating shoulders providing enlargements of said stem and bore, said stem and bore having portions outwardly of said valve of a greater cross-sectional area than across-sec'- tion of said stem through said valve, said stem and bore portions outwardly of said valve having cooperative coaxial surfaces, the surface of said bore being cylindrical, the surface of said stem having portions providing guidingv means slidably engaging with the cylindrical surface throughout the operative relative displacement of said stem and bore, and surfacesother than those serving as guiding means converging outwardly in a manner approaching engagement for providing a discharge orifice at the point of convergence of said surfaces, said discharge orifice having the effective cross-sectional area thereof gradually increased upon movement of said stem in the direction of fuel discharge.

15. A nozzle of the fuel injection type comprising a tip member having a bore therein, a stem member slidably mounted in said bore, said tip and stem members having cooperating shoulders forming a 'valve in said bore intermediate the length of said stem member, spring means positioned inwardly of said valve for closing said valve by inward movement of said stem member, said valve when closed preventing flow of fuel for discharge from said nozzle and being opened in the direction of fuel discharge by fuel pres sure, said cooperating shoulders providing enlargements of said stem and bore, said stem and bore having portions outwardly of said valve of a greater cross-sectional area than a cross-section of said stem through said valve, said stem and bore portions outwardly of said valve having cooperative coaxial surfaces, the surface of said bore being cylindrical, the surface of said stem having portions providing guiding means slidably engaging with the cylindrical surface throughout the operative relative displacement of said stem and bore, and surfaces other than those serving as guiding means converging outwardly in a manner approaching engrgement for providinga discharge orifice at the point of convergence of said surfaces, said discharge orice being eectively closed by said contacting surfaces when said valve is in closed position and having a gradually increasing effective crosssectional area as said valve is moved from its closed position.

16. A nozzle of the fuel injection type comprising a tip member having a bore therein, the outer end of which is counterbored a desired distance providing a shoulder therein intermediate the ends 'of said bore, a stem member disposed in said bore and provided with a reduced inwardly projecting portion, an intermediate portion forming a valve seating inwardly on said shoulder and an outer portion slidably tted into said counterbore and providing contacting guidance for said stem member, said outer portion being formed with at least one depressed portion having a relatively slight outwardly flaring taper whereby an orilce for the outward passage of fuel is provided which increases in area with outward movement of said stem member, and spring means at the vinner end of said tip' member associated with said inwardly projecting portion for normally retracting the latter and seating said valve.

17. "A nozzle of the fuel injection type comprising a tip member having a bore therein, the outer end of which is counterbored .a desired distance providing a shoulder therein intermediate the endsof said bore, a stem member disposed in said bore and provided with a reduced inwardly projecting portion, an intermediate portion forming a valve seating inwardly on said shoulder and an outer portion slidably tted into said counterbore and providing contacting guidance for said stem member, said outer portion having a fuel distributing groove disposed peripherally about the same and formed with a plurality of depressed portions having a relatively slight outwardly flaring taper whereby an orifice for the outward passage of fuel is provided which increases in area with outward movement of said stem member, and spring means at the inner end of said tip member and associated with said inwardly projecting portion of said stem member for normally retracting the latter and seating said valve. 18. A nozzle of the. fuel injection type comprising a tip member having a bore therein, the outer end of which is counterbored a desired distance providing a shoulder therein intermediate the ends of said bore, a stem member disposed in said bore and provided with a reduced inwardly projecting portion, an intermediate portion forming a valve seating inwardly on said shoulder and an outer portion slidably fitted into said counterbore and providing contacting guidance for said stem member, said outer portion being formed with at least one depressed portion having a relatively slight outwardly flaring taper whereby an orice for the outward passage of fuel is provided which increases in area with outward movement of said stem member, said reduced portion having additional guidance means cooperating with the reduced portion of said bore, and spring means at the inner end of said tip member associated with the inwardly projecting portion of said stem member for normally retracting the latter and seating said valve but opening the same for a predetermined pressure of the fuel.

19. A nozzle of the fuel injection type comprising a tip member having a bore therein, the outer end of which is counterbored a desired distance providing a shoulder therein intermediate the ends of said bore, a stem member disposed in said bore and provided with a reduced inwardly projecting portion, an intermediate portion forming a valve seating inwardly on said shoulder and an outer portion slidably tted into said counterbore and providing contacting guidance for said stem member, said outer portion being formed with a plurality of depressed portions having a relatively slight outwardly flaring taper whereby an orice for the outward passage of fuel is provided which increases in area with outward movement of said stem member, said outer portion of said stem member being terminated flush with the outer end surface of said tip member, and spring means at the inner end of said tip member associated with said inwardly projecting portion for normally retracting thev latter and seating said valve.

WARNER T. TABB. EVERETT M. PURDY.

DISCLAIMER 2,263,197.-Wamer T. Tabb, Brooklyn, N. Y., and Everett M. Purdy, New Canaan,

Conn. FUEL INJECTION N ozzLE. Patent dated November 18, 1941. Disclaimer led July 3, 1942, by the mortgagee, The Seg/momn Corporation of Delaware. l

Hereby to the extent of its interest enters this disclaimer to claim 2 of said patent.

[Oficial Gazette August 4, 1942.]

Patent No. 2,265,197.

CERTIFICATE :0E CORRECTION.

` November 18, 19MLV WARNER T'. TABB, ET`AL.

It is hereby certifiedA that error appegars` vin. the printed specification ofthe above numbered patent requiring correction as follows: Page 5, first c lumn, line 18, claim 1o, for "and" read tb,e; and that the said Letters Patent should be vread with this correction therein that the is ame may conformto the Irecord ofthe Case in the Patent'- Office.

Signed and sealed this 50thl day of December, A. D. 1914.1.

4 L l lHenry VenArsdale, (Seal). f I Acting Commissioner of Patents'.` 

